WO2011022985A1 - Method for controlling variation of grain refining ability of al-ti-c alloy by controlling compression ratio - Google Patents

Abstract

A method for controlling variation of grain refining ability of Al-Ti-C alloy by controlling compression ratio comprises: constructing a function about variation of grain refining ability of Al-Ti-C alloy and processing parameters of press working, and controlling variation of grain refining ability of Al-Ti-C alloy precisely by controlling compression ratio precisely at given processing parameters of press working.

Description

 Method for controlling the amount of change in grain refining ability of aluminum-titanium carbon alloy by controlling compression ratio [Technical Field]

 The invention relates to a processing technology of a metal material, in particular to controlling a change amount of grain refining ability of an aluminum-titanium carbon alloy by controlling a ratio of a cross-sectional area before and after pressure processing of an aluminum-titanium carbon alloy, that is, a compression ratio, in the manufacture of an aluminum-titanium carbon alloy. method.

【Background technique】

 Aluminium-titanium carbon alloy is an intermediate alloy that is commonly used in aluminum processing worldwide and is the most effective for refining the solidified grains of aluminum and aluminum alloys. The grain refining ability of aluminum-titanium carbon alloy is one of the important factors determining the quality of aluminum processed materials. The higher the grain refining ability of aluminum-titanium carbon alloy, the higher the yield strength of aluminum-worked material and the higher the calendering plasticity. Good, the lower the ductile-brittle transition temperature, the worse the quality of the aluminum processed material, which is more obvious when the aluminum processed material is applied to aerospace. To this end, all aluminum-titanium carbon alloy manufacturers and research institutes are vigorously strengthening the research on the grain refining ability of aluminum-titanium carbon alloys. The American Aluminum Association also specifies the grain refining capacity value AA (the following tube is called AA value). The AA value is a measure of the grain refining ability of the aluminum-titanium carbon alloy. The smaller the AA value, the stronger the ability of the aluminum-titanium carbon alloy to refine the grain of the aluminum and the aluminum alloy, that is, the smaller the aluminum added with the AA value. The finer the grains of aluminum and aluminum alloys made of titanium-carbon alloy, the lower the AA value from the first 250 to 170. In the existing aluminum-titanium carbon alloy processing technology, the research on material composition and smelting process is generally paid attention to, while the quality control of aluminum-titanium carbon alloy in rolling pressure processing is neglected; pressure processing includes rolling mill rolling and casting There are two types of machine extrusion. At present, it is considered that the pressure processing has no effect on the grain refining ability of the aluminum-titanium carbon alloy. It is also unknown that the ratio of the cross-sectional area before and after the pressure processing is the compression ratio, the temperature difference before and after the pressure processing, and the exit line speed. The relationship between the number of racks and the variation of the grain refining ability of the aluminum-titanium carbon alloy is only empirically controlled by the ratio of the cross-sectional area before and after the pressure processing, that is, the compression ratio, the temperature difference before and after the pressure processing, etc., and a set of quantitative optimization control is not established. Technical method.

[Summary of the Invention]

The invention provides a ratio of the cross-sectional area before and after the pressure processing of the aluminum-titanium carbon alloy, that is, the compression ratio, under the condition of setting the pressure processing parameters such as the temperature difference before and after the pressure processing, the outlet line speed and the number of the racks, A method for accurately controlling the amount of change in the grain refining ability of an aluminum-titanium carbon alloy, solving the problem of the inability to quantitatively and optimally control the pressure processing parameters of the aluminum-titanium carbon alloy, and the resulting grain refining ability of the aluminum-titanium carbon alloy The technical problem of change. The technical solution adopted by the present invention to solve the prior art problem is: Providing a method for controlling the amount of change in grain refining ability of an aluminum titanium carbon alloy by controlling a compression ratio, the method comprising:

 A. Firstly, the change amount of grain refining ability of aluminum-titanium carbon alloy is established. Δ 函数 is a function of the processing parameters in the aluminum-titanium carbon alloy during pressure processing, namely:

 △ AA=K · D · V ÷ (△ T · n )

Where Δ AA=AA _r ΑΑ ₂ , AAi is the grain refining ability value before pressure processing of aluminum-titanium carbon alloy, AA ₂ is the grain refining ability value after pressure processing of aluminum-titanium carbon alloy, K is constant, D is The ratio of the cross-sectional area before and after pressure processing of aluminum-titanium carbon alloy is also the compression ratio, D = , Si is the cross-sectional area before the aluminum-titanium carbon alloy is processed by pressure, and S ₂ is the cross-sectional area after the pressure processing of the aluminum-titanium carbon alloy, Δ Τ is aluminum The temperature difference before and after the pressure processing of titanium carbon alloy, V is the outlet line speed, and n is the number of racks;

 B. Set the processing parameters V, Δ Τ and n, and then precisely control the ratio of the cross-sectional area before and after the aluminum-aluminum alloy pressure processing, that is, the compression ratio D, to precisely control the change amount of the grain refining ability of the aluminum-titanium carbon alloy. Hey.

There is an international standard in the manufacture of aluminum-titanium carbon alloys, that is, the final output of the aluminum-titanium carbon alloy product has a diameter of 9.5 mm, that is, a cross-sectional area of 70.8 mm ² . The functional relationship: Δ ΑΑ = Κ * D * V ÷ ( Δ Τ · η ) can be applied to both the rolling mill for manufacturing aluminum-titanium carbon alloy and the casting extruder for manufacturing aluminum-titanium carbon alloy, the function The relationship is consistent with both single-rack calculations and total calculations for multiple racks, as well as for the calculation of the last rack in multiple racks.

 Compared with the prior art, the invention has the following beneficial effects: The invention overcomes the defects that the technical parameters cannot be quantitatively optimized in the conventional aluminum-titanium carbon alloy pressure processing process, and proves that the control of the processing parameters can accurately control the aluminum-titanium carbon alloy grain. The amount of change in refinement ability. At the same time, after adopting the above scheme, under the condition of setting the pressure of the pressure processing parameters such as the temperature difference before and after the processing, the exit line speed and the number of the rack, the ratio of the cross-sectional area before and after the pressure processing of the aluminum-titanium carbon alloy is precisely controlled, that is, the compression ratio , can accurately control the change of grain refining ability of aluminum-titanium carbon alloy; the larger the change of grain refining ability, the grain refining ability value before the aluminum-titanium carbon alloy pressure processing ΑΑ-time, then aluminum-titanium The smaller the grain refining capacity after carbon alloy pressure processing, the stronger the ability of aluminum-titanium carbon alloy to refine aluminum and aluminum alloy grains.

[Description of the Drawings]

1 is a schematic structural view showing a continuous casting and rolling production process of a method for controlling a change amount of grain refining ability of an aluminum-titanium carbon alloy by controlling a compression ratio according to the present invention; 2 is a schematic structural view showing a continuous casting and squeezing production process for applying a method for controlling a change amount of grain refining ability of an aluminum-titanium carbon alloy by controlling a compression ratio;

 3 is a schematic view showing a single-stand structure of a rolling mill in which a method for controlling a change in grain refining ability of an aluminum-titanium carbon alloy by controlling a compression ratio is applied;

 Fig. 4 is a schematic view showing the structure of a casting extruder for applying a method for controlling the amount of change in grain refining ability of an aluminum-titanium carbon alloy by controlling a compression ratio.

 The relevant part names in Figs. 1 to 4 are: 坩埚 10, crystallization wheel 20, rolling mill 30, roll 31, casting extruder 40, and coolant 50.

【detailed description】

 After long-term experiment, the applicant of the case concluded that the pressure processing parameters will directly affect the grain refining ability of the aluminum-titanium carbon alloy during the aluminum-titanium carbon alloy pressure processing. To this end, the applicant conducted experiments through imported continuous casting and rolling equipment, the company's own continuous casting and rolling equipment, and the applicant's own continuous casting and coextrusion equipment, and explored the pressure processing parameters and aluminum-titanium carbon alloy grains. The relationship between the amount of change Δ ΑΑ of the refinement ability; the following is a list of some experimental data obtained by the applicant in the experiment:

 Table 1

 △ τ Δ

S ₂ ( mm ² ) D = ^ V ( m/s ) n AAi AA ₂

 Si (.c ) AA

 760 70.8 10.7 3 3 7 7.9 170 162

780 70.8 11.0 3 3 7 8.1 170 162

800 70.8 11.3 3 3 7 8.3 170 162

960 70.8 13.6 3 3 7 9.9 170 160

980 70.8 13.8 3 3 7 10.1 170 160

1000 70.8 14.1 3 3 7 10.4 170 160

1160 70.8 16.4 3 3 7 12.0 170 158

1180 70.8 16.7 3 3 7 12.2 170 158

1200 70.8 16.9 3 3 7 12.4 170 158

760 70.8 10.7 4 6 8 10.3 170 160

780 70.8 11.0 4 6 8 10.6 170 159

800 70.8 11.3 4 6 8 10.9 170 159 960 70.8 13.6 4 6 8 13.0 170 157

980 70.8 13.8 4 6 8 13.3 170 157

1000 70.8 14.1 4 6 8 13.6 170 156

1160 70.8 16.4 4 6 8 15.8 170 154

1180 70.8 16.7 4 6 8 16.0 170 154

1200 70.8 16.9 4 6 8 16.3 170 154

760 70.8 10.7 5 9 10 9.9 170 160

780 70.8 11.0 5 9 10 10.2 170 160

800 70.8 11.3 5 9 10 10.4 170 160

960 70.8 13.6 5 9 10 12.5 170 157

980 70.8 13.8 5 9 10 12.8 170 157

1000 70.8 14.1 5 9 10 13.0 170 157

1160 70.8 16.4 5 9 10 15.1 170 155

1180 70.8 16.7 5 9 10 15.4 170 155

1200 70.8 16.9 5 9 10 15.7 170 154 There is an international standard in the manufacture of aluminum-titanium carbon alloys, that is, the final output of the aluminum-titanium carbon alloy product has a diameter of 9.5 mm, that is, a cross-sectional area of 70.8 mm ² . Table 1 shows the experimental data obtained by using the continuous casting and rolling equipment. The continuous casting and rolling equipment includes the rolling mill 30, the cooling module of the aluminum-titanium carbon alloy during the cooling pressure processing, and the cooling module including the temperature before and after the pressure processing of the aluminum-titanium carbon alloy. Thermometer. The aluminum-titanium carbon alloy is subjected to press working by the two rolls 31 of the rolling mill 30 in cooperation with the rolling mill, and the aluminum-titanium carbon alloy is solid before, during and after the press working. In pressure processing, there are two temperature nodes, that is, before and after decompression; during the pressure processing of the rolling mill 30, the instantaneous temperature and input temperature of the aluminum-titanium carbon alloy before compression are approximately equal, and the moment after decompression The temperature and the output temperature are approximately equal. Therefore, it is convenient to measure the temperature of the aluminum-titanium carbon alloy before and after the press processing on the rolling mill 30.

1 is a schematic structural view of a continuous casting and rolling production process for controlling a change amount of grain refining ability of an aluminum-titanium carbon alloy by controlling a compression ratio, and an aluminum-titanium carbon alloy melt from a crucible 10 passes through a crystallizing wheel 20 An aluminum titanium carbon alloy rod is formed, and then a rod-shaped aluminum titanium carbon alloy is introduced into the rolling mill 30 for press working. The number of frames n of the rolling mill 30 may be 3, 4, 5, 6, 7, 8, 9, 10. As shown in Fig. 1, the number of frames n in the rolling mill 30 is 10. As shown in FIG. 3, the roll 31 in the rolling mill 30 can The cross-sectional area S _l before the aluminum-titanium carbon alloy is subjected to pressure processing and the roll 31 can be adjusted so as to satisfy the cross-sectional area S ₂ after the aluminum-titanium carbon alloy is subjected to press working. There are at least two temperature detectors to detect the temperature before and after the aluminum-titanium carbon alloy rolling pressure processing. The temperature before the aluminum-titanium carbon alloy is processed is 300-450 ° C. The temperature of the aluminum-titanium carbon alloy after passing through the rolling mill 30 Raising, the cooling module sprays the coolant on the roll 31 of the rolling mill 30 and the rolled aluminum-titanium carbon alloy; by controlling the flow rate of the cooling liquid 50, the temperature difference ΔΤ before and after the aluminum-titanium carbon alloy is subjected to pressure processing is controlled within a reasonable range. The cooling liquid 50 may be water; finally, the aluminum titanium carbon alloy is formed from the rolling mill 30 to form an aluminum titanium carbon alloy rod.

 From the experimental data obtained from the continuous casting and rolling equipment in Table 1, the functional relationship between the pressure processing parameters obtained by the applicant after repeated research and summary and the change amount ΔΑΑ of the grain refining ability of the aluminum-titanium carbon alloy is: ΔΑΑ=Κ · D · V÷ ( ΔΤ · n)

Where Δ ΑΑ = ΑΑ - AA ₂ , ΑΑ is the grain refining ability value before the aluminum-titanium carbon alloy is subjected to pressure processing, and AA ₂ is the grain refining ability value after the aluminum-titanium carbon alloy is subjected to pressure processing, and K is a constant, 1 Numerical calculation shows that K is 5.13, D is the ratio of the cross-sectional area before and after pressure processing of aluminum-titanium carbon alloy, that is, the compression ratio, _D = , Si is the cross-sectional area before the aluminum-titanium carbon alloy is subjected to pressure processing, and S ₂ is the aluminum-titanium carbon alloy. The cross-sectional area after pressure processing, ΔΤ is the temperature difference before and after the aluminum-titanium carbon alloy pressure processing, V is the outlet line speed, ΔΤ and V have a function relationship: V=3AT— 6, V> lm/s, and the exit line speed V The maximum value currently achievable is 30m/s, where n is the number of racks.

The functional relationship: AAA = K * D * V ÷ ( Δ Τ · η) in line with the total calculation of the plurality of stands of the rolling mill, also in line with the calculation of the single frame of the rolling mill, such as the calculation of the last frame of the rolling mill; When η = 1, it must refer to the calculation of the last rack. The cross-sectional area of the aluminum-titanium carbon alloy output in the last rack is 70.8 mm ² .

In the manufacture of aluminum-titanium carbon alloy, general pressure processing parameters such as: temperature difference before and after pressure processing △ T, outlet line speed V and frame number η are fixed after setting, by precise control of aluminum-titanium carbon alloy pressure processing The ratio of the front and rear cross-sectional areas, that is, the compression ratio D, can accurately control the amount of change ΔΑΑ of the grain refining ability of the aluminum-titanium carbon alloy. As shown in Table 1, when AT=4°C, V=6m/s, n=8, the ratio of the cross-sectional area before and after the pressure processing of the aluminum-titanium carbon alloy is controlled, that is, the compression ratio D is changed from 10.7 to 16.9. The amount of change in the grain refining ability of the aluminum-titanium carbon alloy can be accurately controlled. The Δ AA is changed from 10.3 to 16.3. When the grain refining ability value of the aluminum-titanium carbon alloy before the pressure processing is 170, the aluminum-titanium carbon alloy is subjected to pressure processing. The subsequent grain refining ability value AA _{2 is} varied from 160 to 154. 891 OLl £T 1 ς 611 9τι 8ΌΔ 096

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 U (s/ui)A (strict) 3⁄4

V XV SSZ.0/0T0ZN3/X3d S86 and ΐΐΟΖ OAV 980 70.8 13.8 149 5 1 2.4 170 168

1000 70.8 14.1 149 5 1 2.4 170 168

1160 70.8 16.4 149 5 1 2.8 170 167

1180 70.8 16.7 149 5 1 2.9 170 167

1200 70.8 16.9 149 5 1 2.9 170 167

1360 70.8 19.2 149 5 1 3.3 170 167

1380 70.8 19.5 149 5 1 3.4 170 167

1400 70.8 19.8 149 5 1 3.4 170 167

760 70.8 10.7 151 6 1 2.2 170 168

780 70.8 11.0 151 6 1 2.2 170 168

800 70.8 11.3 151 6 1 2.3 170 168

960 70.8 13.6 151 6 1 2.8 170 167

980 70.8 13.8 151 6 1 2.8 170 167

1000 70.8 14.1 151 6 1 2.9 170 167

1160 70.8 16.4 151 6 1 3.3 170 167

1180 70.8 16.7 151 6 1 3.4 170 167

1200 70.8 16.9 151 6 1 3.5 170 167

1360 70.8 19.2 151 6 1 3.9 170 166

1380 70.8 19.5 151 6 1 4.0 170 166

1400 70.8 19.8 151 6 1 4.0 170 166 There is an international standard in the manufacture of aluminum-titanium carbon alloys, that is, the final output of the aluminum-titanium carbon alloy product has a diameter of 9.5 mm, that is, a cross-sectional area of 70.8 mm ² . Table 2 shows experimental data obtained using the applicant's own continuous casting and coextrusion equipment. The continuous casting and squeezing equipment includes a casting extruder 40, a cooling module of aluminum-titanium carbon alloy during cooling pressure processing, and a cooling module including a temperature detector for detecting the temperature before and after pressure processing of the aluminum-titanium carbon alloy. The aluminum-titanium carbon alloy is subjected to press working inside a roll of the casting extruder 40. The aluminum-titanium carbon alloy is solid before and after the press working, and is semi-solid during the press working. In the pressure processing, there are two temperature nodes, that is, before and after decompression; in the pressure processing of the casting extruder 40, the instantaneous temperature of the aluminum-titanium carbon alloy before the compression is the temperature at which the friction occurs as a hot spot, after decompression The instantaneous temperature is the temperature at which it is extruded from the casting extruder 40. Therefore, attention should be paid to the accuracy of detecting the temperature at two points before and after the aluminum-titanium carbon alloy press working on the casting extruder 40. 2 is a schematic structural view of a continuous casting and squeezing production process for controlling a change amount of grain refining ability of an aluminum-titanium carbon alloy by controlling a compression ratio, and an aluminum-titanium carbon alloy melt from 坩埚10 passes through a crystallization wheel 20 The aluminum titanium carbon alloy rod is formed, and then the rod-shaped aluminum titanium carbon alloy is subjected to pressure processing by the casting extruder 40. The number n of the frame of the casting extruder 40 is 1 as shown in FIG. 2, as shown in FIG. 4, the casting extruder 40 It can withstand the cross-sectional area S _l before the aluminum-titanium carbon alloy is subjected to pressure processing and can be adjusted so as to satisfy the cross-sectional area S ₂ after the aluminum-titanium carbon alloy is subjected to pressure processing. There are at least two temperature detectors for detecting the temperature before and after the aluminum-titanium carbon alloy pressure processing. The temperature of the aluminum-titanium carbon alloy is increased during the processing in the casting extruder 40, so that the aluminum-titanium carbon alloy is semi-fluid and cooled. The module sprays the coolant into the roller of the casting extruder 40. By controlling the flow rate of the coolant, the temperature difference Δ Τ before and after the aluminum-titanium carbon alloy is processed in a reasonable range, the coolant can be water; and finally the aluminum-titanium carbon alloy Extruded from the casting extruder 40 to form an aluminum titanium carbon alloy rod.

 From the experimental data obtained from the continuous casting and coextrusion equipment in Table 2, the functional relationship between the pressure processing parameters obtained by the applicant after repeated research and summary and the change amount Δ ΑΑ of the grain refining ability of the aluminum-titanium carbon alloy is : Δ ΑΑ = Κ · D · V ÷ ( Δ Τ · n )

Δ ΑΑ ΑΑ is the grain refining capacity value before pressure processing of aluminum-titanium carbon alloy, and AA ₂ is the grain refining ability value after pressure processing of aluminum-titanium carbon alloy, K is a constant, which is calculated by the numerical calculation in Table 1. K is 5.13; D is the ratio of the cross-sectional area before and after the pressure processing of the aluminum-titanium carbon alloy, that is, the compression ratio, _D = , Si is the cross-sectional area before the aluminum-titanium carbon alloy is subjected to pressure processing, and S ₂ is the aluminum-titanium carbon alloy.

The cross-sectional area after press working, Δ Τ is the temperature difference before and after the aluminum-titanium carbon alloy pressure processing, V is the outlet line speed, n is the number of racks, n=l.

The functional relationship: Δ AA=K · D · V ÷ ( Δ T · n ) corresponds to the calculation of a single frame of the casting extruder. When n=l, it must refer to the calculation of the last rack, the last one. The cross-sectional area of the output aluminum-titanium carbon alloy product in the rack is 70.8mm ² .

In the manufacture of aluminum-titanium carbon alloy, the general pressure processing parameters such as: the temperature difference Δ Τ before and after the pressure processing, the outlet line speed V and the number of frames η are fixed after setting, and then the aluminum titanium alloy pressure is precisely controlled. The ratio of the cross-sectional area before and after the processing, that is, the compression ratio D, can accurately control the amount of change Δ ΑΑ of the grain refining ability of the aluminum-titanium carbon alloy. As shown in Table 2, when AT=150 °C, V=4m/s, n=l, the ratio of the cross-sectional area before and after the pressure processing of the aluminum-titanium carbon alloy is controlled, that is, the compression ratio D is changed from 10.7 to 19.8. The amount of change Δ AA of the grain refining ability of the aluminum-titanium carbon alloy can be accurately controlled from 1.5 to 2.7. The grain refining ability value AAi of the aluminum-titanium carbon alloy before the pressure processing is a certain value of 170, the aluminum-titanium alloy pressure The grain refining ability value AA ₂ after processing is changed from 169 Turned to 167.

 The invention overcomes the defects that the technical parameters of the conventional aluminum-titanium carbon alloy are not quantitatively optimized during the pressure processing, and proves that the control of the processing parameters can accurately control the variation of the grain refining ability of the aluminum-titanium carbon alloy. At the same time, after adopting the above scheme, in the case of setting the pressure processing parameters, the temperature difference before and after the pressure processing, the exit line speed and the number of racks, and then precisely controlling the ratio of the cross-sectional area before and after the aluminum-aluminum alloy pressure processing, that is, compression The ratio of the grain refining ability of the aluminum-titanium carbon alloy can be precisely controlled, and the amount of grain refining ability is changed. The grain refining ability value of the aluminum-titanium carbon alloy before the pressure processing is AA-timed, then aluminum The smaller the grain refining ability value AA of the titanium carbon alloy after press working, the stronger the ability of the aluminum titanium carbon alloy to refine the grain of aluminum and aluminum alloy.

 The above is a further detailed description of the present invention in connection with the specific preferred embodiments, and the specific embodiments of the present invention are not limited to the description. It is to be understood by those skilled in the art that the present invention can be delineated or replaced without departing from the spirit and scope of the invention.

Claims

Claim  A method for controlling a change amount of grain refining ability of an aluminum titanium carbon alloy by controlling a compression ratio, the method comprising:  A. Firstly, the change amount of grain refining ability of aluminum-titanium carbon alloy is established. Δ 函数 is a function of the processing parameters in the aluminum-titanium carbon alloy during pressure processing, namely: △ AA=K · D · V ÷ (△ T · n ) where K is a constant, D = , Si is the cross-sectional area before the aluminum-titanium carbon alloy is subjected to pressure processing, s ₂ is

The cross-sectional area of the aluminum-titanium carbon alloy after pressure processing, Δ Τ is the temperature difference before and after the aluminum-titanium carbon alloy pressure processing, V is the outlet line speed, and n is the number of racks;  B. Set the processing parameters V, Δ Τ and n, and then precisely control the ratio of the cross-sectional area before and after the aluminum-aluminum alloy pressure processing, that is, the compression ratio D, to precisely control the change amount of the grain refining ability of the aluminum-titanium carbon alloy. Hey.